I will be putting in two PRIs in a MICS. I have done several of these with only one PRI.
What will be different. I will want them to dial out 9 as you would with one. But will the programming be the same? I believe i need only one enabler for this.
Thanks in advance.

Enable both of them in maintenance. You should be good to go. Once the cabinet is enabled that is all you need for the PRi.

I would be sure to have the ID code written down on a label. If the cabinet dies, you may need to have the code restored on another cabinet.